Growing Delphinium in the US northeast

I've recently fallen in love with Delphinium but I know that some of the spectacular varieties such as the Pacific Giants and probably the classic UK Blackmore and Langdon hybrids won't do well here in Massachusetts because of our hot and humid summers. Am wondering if anyone has maybe had luck with the New Millennium series from New Zealand. In general, I'd like to hear what species/cultivars/hybrids fellow northeasterners have had good luck with.

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